Topic: CB750K3 broken chain small case hole...yes I know you've all ehard this before..

[Duck]

But, I couldn't find an answer with search or in the FAQ.

Chain taped a small approx 1" x 3/4 inch hole in the top case just in front of the sprocket. No big deal except, the PO says he thinks the piece is in the case. I'm curious as to know if I can expect to have enough space to find and remove if I pull the sump. If so, I'll dig in next weekend. If not, and I have to split the case and it's gonna have to wait until thanksgiving break. I'm very busy with school for the next 4 semesters so bike wrenching time is severely restricted.

I just got the bike. It's pretty nice overall. Original paint, no rust, good saddle, all there incl. owners manual, title, and a new chain :-)

-Duck

[Johnie]

This might help you  out: http://forums.sohc4.net/index.php?topic=35239.0

[Duck]

Thanks. I've no problem with the hole it's the chunk of aluminum that's hiding out in the crankcase that's a worry. Unless someone has been fishing around via the sump opening and can offer advice, I'll have a go and report back. Dental mirror and some wire chopsticks should do the trick if there's enough room to get the mirror in there and look around.

[Johnie]

Find a proctologist and ask to use his scope. Now that would be cool. Man, if you can get a mirror in there that must be a big hole. Although I think you would stand a better chance of fixing it if you could patch it with the broken piece. I wish you luck in finding it. Let us know how you come out.

[blackhog02]

Pull the oil pan and I bet you will find it.  You could read the part numbers of of the chunks of aluminum that I had in my oil pan.  I got a local welder to weld it up for me with out even having to pull the motor. 

[Duck]

This is great news.
I'll get a gasket ordered Monday and dig in next weekend.
-Bob

[Bill/BentON Racing]

I know its aluminum but if it was to get picked up could easily lock something up,if you know its inside,get it OUT.
Should have seen CB1100F another shop serviced @ 600m, Oh cam sprocket bolt missing,must have forgotten it,much more likely tech dropped it and just replaced,well it stayed put for several hundred miles and then decided it would accompany piston on its journey up the cylinder,NOT,locked up ,rider fell,was OK,broke engine cases,cylinder,it was ugly,so be careful!,Bill

[Duck]

I strongly suspect it's inside.
Final drive chain broke.
PO says he did not notice hole until made evident by oil spray, after replacing broken chain.
Says he looked all around his work area and could not find the piece.

Will report back for the curious.

Do you have a photo of the broken 1100?